Facile Fabrication of Functionally Graded Graphene

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High Throughput Continuous Production of hBN Using. Compressible Flow ... K.M Al-Shurman, CVD Grown Graphene on Ni Thin Film. 2. Huihui Zhu, Journal of ...
High Throughput Continuous Production of hBN Using Compressible Flow 1 Islam

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Md Akibul Sheikh Reza 1Dept. of Mechanical, Industrial and Manufacturing Engineering, University of Toledo, Ohio Abstract

Introduction to Compressible Flow Exfoliation

Over the past decade, comprehensive investigations have been conducted to develop two-dimensional (2D) materials to harness their excellent and unprecedented properties such as high electrical conductivity, optical transparency, mechanical strength, and flexibility. This necessitates developing means for their mass production. This study details a newly conceived compressible flow exfoliation method for producing 2D h-BN nano sheets using a multiphase flow of 2D layered materials suspended in a high pressure gas undergoing expansion. The expanded gas-solid mixture is sprayed in a suitable solvent, where a significant portion (up to 10%) of the initial hexagonal boron nitride (hBN) material is found to be exfoliated with a mean thickness of 4.2 nm. Moreover, 43% of the exfoliated h-BN were found to be 10 layers or less thick while having a mean flake length of 276 nm and concentration of 0.22 mg/mL in Isopropyl Alcohol (IPA) after centrifugation.

Material Collection Process

Length and Thickness Distribution of h-BN Nano Sheets

Process Parameters

What are 2D materials

SS-1KS4 – needle Valve 4.4 mm orifice Cv – 0.37 CFD Simulation of the needle valve

Application

Exfoliation Quality of h-BN Synthesis

Acknowledgements References: 1. K.M Al-Shurman, CVD Grown Graphene on Ni Thin Film 2. Huihui Zhu, Journal of Mat Sc, 2016 3. Artur Ciesielski, Chem. Soc.Rev., 2014 4. P.Karagiannidis, ACS Nano, 2016

1. Department of Chemistry and Bio Chemistry, UCLA 2. Department of Chemical Engineering, University of Toledo